Website redirects to another website

Symptoms

• The website sub.example.com created in Plesk redirects to sub.example2.com which also exists in Plesk
• There is also an alias example.com in Plesk for example2.com
• There is a subdomain sub.example2.com in Plesk for example2.com
• Apache configuration file of sub.example2.com /var/www/vhosts/system/sub.example2.com/conf/httpd.conf has sub.example.com declared as an alias: 

  [...]
   ServerName "sub.example2.com:443" 
   ServerAlias "www.sub.example2.com" 
   ServerAlias "ipv4.sub.example2.com" 
   ServerAlias "sub.example.com" 
   ServerAlias "www.sub.example.com" 
   ServerAlias "ipv4.sub.example.com" 
   [...]

Cause

This is caused by a bug in Plesk with id #PPPM-10052 which is planned to be fixed in future updates.

Resolution

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As a workaround, Web service for the alias can be disabled. As a result, sub.example.com will not be mentioned in /var/www/vhosts/system/example2.com/conf/httpd.conf configuration file. This can be achieved by:

1. Log in to Plesk
2. Navigate to Home->Subscriptions->example2.com->Websites & Domains
3. Uncheck the “Web service” checkbox for alias example.com.